Boss Battle Gamemode

I've been thinking about this idea for quite a while and I'm wondering what your thoughts on this are. This game mode takes place on an oval-shaped map and in the center is the boss monster (Baron on steroids? lol). The objective for both teams is to slay the monster (obvious) before the other team does. Now there are two ways a team can win the game. The team that kills the monster wins is one way, but the other way is the team that has dealt the most damage to the monster before time runs out wins.

So what are your thoughts? Do you like the idea or not? If not, you can add in why and/or what parts of my idea you disagree with.